Or

Author:
Colin S

To teach kids about inequalities.

This packet has a table to demonstrate what to do when multiplying/dividing by a negative number. It has vocabulary for the rule. It also has a couple problems to solve and some games.

Tutorial

Equation |
Added to Both Sides |
New Equation |
True or False |

10 > 8 |
+3 |
13 > 11 |
True |

10 > 8 |
-7 |
3 > 1 |
True |

10 > 8 |
* 2 |
20 > 16 |
True |

4 < 6 |
/4 |
1 < 1½ |
True |

4 < 6 |
*-3 |
-12 < -18 |
False |

4 < 6 |
/-6 |
-2/3 < -1 |
False |

Source: Mr. Hennen

When multiplying or dividing by a negative number, you must reverse the inequality symbol.

Source: Mr. Hennen